Wrench.



E. H. ANDERSON.

RENGH.

APPLIOA FILED MAR. a, 1912.

1,032,580. Patentd July 16, 1-912.

\X/IT ESSEi' UNITED STATES PATENT OFFICE.

EDWARD H. ANDERSON, 0F DURHAM, MAINE, ASSIGNOR OF ONE-HALF TO MICHAELBROWNS TEIN, OF LEVVIS'ION, MAINE.

WRENCH.

Specification of Letters Patent.

Patented July 16, 1912.

Application filed March 6, 1912. Serial No. 681,914.

To all whom it may concern: I 1

Be it known that I, 'EDWARD I-l. ANDER- soN, a citizen of the UnitedStates, residing at Durham, in the county of Androscoggin and State ofMaine, have invented. certain new and useful Improvements in Wrenches,of which the following is a specification.

In the drawing herewith accompanying and forming a part of thisapplication, F

ure 1 is a side elevation of my improved wrench partly in section; Fig.2 is an inside side view of the movable jaw; Fig. 3 is a side view ofthepawl. operating lever; Fig. 4 is a vertical sectional view of the pawl;

Fig. 5 is a plan view of the pawl lever returning spring before beingbent to position; and Fig. 6 is an edge view of the pawl, pawl lever andspring'assembled.

Same reference characters indicate like parts in the several figures.

In the drawings A is the handle of the wrench, B the shank, C the fixedjaw and D the movable jaw. The movable jaw is provided with an' endwiseshank receiving socket E and moves back and forth 'on the shank relativeto the fixed jaw.

In the front of the movable jaw is a pawl lever receiving opening F andon the inside of each side of the movable jaw are forwardly extendingangular grooves G formed one on each side in the inside of the movablejaw. In the opening F is mounted a pawl operating lever H provided witha projecting finger piece I and trunnions J projecting slightly beyondthe sides of the pawl lever, as seen in Fig. 6, whichtrunnions take intoand travel in said grooves G and against the angular projection K whichforms one of the sides of said groove. Pivotally attached to theunderside of the pawl lever and sliding in rearwardly inclined groovesGr formed on each side in the inside of the movable jaw is a ratchetpawl L provided with ratchet teeth M adapted to engage the teeth on arack N in the face of the shank of the wrench. The pawl is bifurcatedforming a lever receiving socket O and ears Q to which the pawl lever ispivotally secured by a pivot P passing through ears Q, of the pawl andthe pawl lever.

The lpawl sets diagonally relative to the shank of the wrench when inposition and the face R is in engagement with and slides against asimilar inclined face S on the sliding jaw.

The pawl lever is held in locked position by the constant tension of aspring T arranged in any convenient way. As shown it consists of aspring provided with laterally extending ears U, one on each side, whichtake into ear receiving sockets V in the face R of the pawl. It is thenbent around the pawl through the socket 0 up against the underside IV ofthe pawl lever, so that, when the pawl lever is moved outwardly tounlock the pawl, it compresses the spring W toward-the shank between theprojections K, and as soon as the pawl is released the tension on thespring bearing against the outer end of the pawl lever turns it backinto the position shown in Fig. 1. y

In assembling the parts the pawl lever is inserted through the openingin the end of the movable jaw, the trunnions taking into'the grooves G.The pivoted pawl is then inserted in the open outer end of the movablejaw and properly positioned relative to lever I. The lever and pawl arethen moved down until the hole for pivot P comes directly opposite ahole Z in the wall of the movable jaw, in which position the pivot pin Pcan be inserted through said hole Z, thus pivoting pawl and pawl levertogether.

It is to be noted that, the pawl extending diagonally to the shank inthe groove between sides S and the projection K and the rack teeth beingsubstantially parallel with the direction of the teeth of the rack, itis always easy to disengage the pawl from the rack.

To adjust the movable jaw on the shank, the pawl is raised from the rackby raising the outer end of the pawl lever. As the outer end is raisedthe trunnions move down in the groove G toward the shank of the wrench,compressing the spring and lifting the pawl teeth out of the rack. Assoon as the pawl is clear of the rack the jaw can be moved intoengagement with the object to be gripped. The pawl lever is thenreleased and the spring returns the pawl immediately into engagementwith the rack.

The spring may be omitted if desired. Changes in the shape of the pawllever and pawl and the method of connecting them up and adapted to bemoved into and out of engagement with said rack, a pawl operating leverpivotally attached to said pawl and pivotally mounted in said movablejaw, a forwardly extending guide groove in the inside of the movable jawand laterally extending trunnions on the pawl lever adapted to travel insaid groove.

2. In a monkey wrench, a shank provided with a rack on the edge thereofand two, aws, one fixed and the other movable, rearwardly and forwardlyextending grooves in the 1ns1de of the movable aw, a ratchet'pawlmounted in said rearwardly extending groove adapted to be moved into andout of engagement with said rack, a pawl lever pivotally connected withsaid pawl and provided with laterally extending trunnions adapted totake into and travel in said forwardly extending grooves.

3. In a monkey wrench, a shank provided with a rack and with two jaws,one fixed and the other movable, the movable jaw be ing provided withrearwardly and forwardly extending grooves in the inside walls thereofinclined to the rack,a ratchet pawl adapted to engage said rack, a pawlactuating lever pivotally attached to said pawl and to said jaw andprovided with trunnions adapted to travel in said forwardly extendinggrooves and means for automatically returning the pawl lever to its downposition and holding it yieldingly in its down position. i

4. In a monkey wrench, a shank provided with a rack and with two jaws,one fixed and the other movable, said movable jaw being provided withrearwardly and forwardly extending grooves in the inner walls thereofinclined to the plane of the rack and a ratchet pawl adapted to be movedinto and out of engagement with said rack, a pawl lever pivotallymounted between the arms of the pawl and provided with trunnions adaptedto travel in said forwardly extend ing grooves, and a spring secured,one end to the pawl and the other end extending out along and in thepath of the inner free end of the pawl lever, whereby the spring tendsto return and hold the pawl lever in its down position.

EDlVARD H. ANDERSON.

\Vitnesses:

BERTHA M. BENSON, J OHN D. CLIFFORD, J r.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, I). G.

